Combined cycle power plant
Hemweg 9 is a new combined cycle gas fired power plant at the Hemweg power station located in the western port area of Amsterdam, Netherlands. The power station is owned and operated by Nuon, a subsidiary of Vattenfall.
The new 435MW Hemweg 9 plant became operational in May 2012. The Hemweg power station now consists of two generating units, namely Hemweg 8, a 630MW coal fired power plant, and the recently opened Hemweg 9. The current installed capacity of the power station is 1,065MW.
Hemweg 9 was built as a replacement of the old Hemweg 7 gas based power plant. The new unit is a modern combined cycle gas fired power plant with greater efficiency and better environmental performance.
The new Hemweg power plant can generate enough power to meet electricity needs of around 750,000 homes. The plant will also supply heat besides electricity, in future.
Nuon took an investment decision in early 2010 to replace the Hemweg 7 with a new plant based on modern combined cycle gas turbine (CCGT) technology for more efficient and environmentally-friendly power generation at Hemweg. The 511MW Hemweg 7 conventional gas-fired power plant was in operation since 1979.
Hemweg 9 delivered its first electricity to the Dutch power grid in May 2012. Hemweg 7 was closed at the beginning of January 2013, after 34 years of operation. The gas turbine that was added to Hemweg 7 in 1988, however, remains in use for peak electricity demand.
The Hemweg 9 natural gas-fired power plant, based on combined cycle operation, is located adjacent to the existing Hemweg 8 coal-fired power plant.
The new plant consists of a gas turbine, steam turbine and a generator arranged on a single shaft. It also has a heat recovery steam generator (HRSG) provided by NEM. The power generated by the new plant is transmitted via the existing 150 kV switching station at Hemweg.
Siemens was awarded the turnkey construction contract for the new plant in April 2010. Construction works for the new plant started in July 2012.
Siemens also supplied the gas turbine, steam turbine, generator, the entire electrical equipment and the instrumentation and controls (I&C) system for the plant. Furthermore, Siemens is responsible for the long term maintenance of the plant.
PORR was subcontracted the main construction works of the project that involved 35,500m³ of excavation, 9,000m³ of backfilling, 10,000m³ of concrete and 1,100t of reinforcement. Koch Engineering & Construction was responsible for the basic engineering of the project.
Victaulic Construction Piping Services (CPS) provided the piping system for the natural gas based power plant. NEM provided the heat recovery steam generator (HRSG) for the power plant.
The plant uses the Siemens F-Class heavy duty gas turbine (SGT5-4000F), which has a gross power output of 292MW. The gas turbine consists of two rotor bearings, disc type rotor and single-crystal blades. It operates with a 15-stage axial-flow compressor fitted with variable-pitch inlet guide vanes, and an annular combustion chamber with 24 hybrid burners.
The SGT5-4000F gas turbine technology is known for its high performance, low cost power generation and significantly low emissions of NOx and CO2. Other aspects of the Combined Cycle power plant include a two-flow low-pressure steam turbine (SST5-5000) and a hydrogen-cooled generator, both provided by Siemens.
The plant is installed with a Siemens Power and Process Automation T3000 (SPPA-T3000) instrumentation and controls (I&C) system.
Hemweg 9 produces electricity from natural gas at an efficiency of 59%, which is 50% better than Hemweg 7. The new plant emits significantly less nitrogen oxides (NOx). Its CO2 emissions are also 30% lower than that of the Hemweg 7. Hemweg 9 is designed for cogeneration operation, although it is currently generating only electricity. Its energy efficiency will be increased further when it starts supplying heat.
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